Eliminating hunger and undernutrition is key to ending extreme poverty. Doing so will pave the way for achieving multiple Sustainable Development Goals (SDGs)—the anchor of the post-2015 agenda. We can end hunger and undernutrition—and we can do so by 2025. Compact2025 will serve as a global knowledge and innovation hub to experiment, learn, and share evidence for pragmatic, action-oriented strategies. It will offer evidence-based context-specific strategies to support countries, institutions, and initiatives for the elimination of hunger and undernutrition by 2025.